Apparatus for drawing tubing containing a stripe of contrasting glass



July 25, y'1933.

*i APPARATUS FOR DRAWING TUBING CONTAIING A STRIPE OF CONTRASTING GLASS w. H. SAID 1,919,259

Filed July 22, 1932 .34 wu/AN Han/Afm 6mp BY n M ATTORNEYS.

one side a receptacle 25 glass is introduce scare eatin '4o ing opening a blocks 1s by Y Patented July 25, 1933 WILLIAI HOWARD SAID, 0l'

WORKS, 0l GOBNIN'G,

mana'rus ron Duwnta TUBING com comme, NEW Yonx. 'assroxon rro comme Guss m Yoan, a conformaronr or NEW vom:

Amma v.a swarm or con'rnas'rme @Lass Application med July 38, 1933. Serial Io. 824,039.

This invention relates to tube drawing apparatus and more particularly to apparatus for the production of instrument tubin such as is employed in the manufacture o thermomters and the like. l

The object of the invention is to accurately shape the glass as it is being drawn and to definitely shape and locate the color stripe in the finished tubing.Y

Another object is to simplify the operation and the apparatus for the production of tubincontamin a; contrasting stripe. v

mong its eatures my invention embodies a container for molten glass having adjacent for molten contrasting A glass, and a drawing ot having a lass inlet submerged below the evel of the g ass in the container, said drawing potv forming a Shaper to overn the shape ofthe glass as it is drawn 2`o an having an opening 1n 1ts bottom through which air to form the bore may be introduced into the glass as it is being drawn and a nipple in the drawing pot, said nipple communicating with the rece tacle whereby contrasting into thelglass which is bemg drawn, said nipple serving as a Shaper for shaping the contrastingglass as it enters the glass which is being drawn. f Fi 1 is a horizontal sectional view through furnace showing my glass contailiersA an drawing pot in place therein;

Fig. 2 is a lonlgitudinal sectional view on the' 1m@ 2f-2 of ig. 1.

as Referringuto the drawing in detail, the

i mace designated generally 1 0 comprises a bottom 11, end walls 12, side walls 13 and a cover block 14 which latter is formed with lling K the usual ports (not shown) for the admission of heating burners by which the temperature is maintained vat the desired degree.

Resting on the bottom 11 are supporting 19 is sup rted in spaced relation to t e bottom of t e furnace. The end wall 20 of the container 19 is formed withan openin 21 near its bottom which communicates wi 60 the interiorof a receptacle 22 for contrast- Formed near the bottom 27 being openings-15 and 16 anda 'draw- 1 The furnace is provided with which a container for moltening glass. Surrounding the opening 21 and rojecting into the container 19 is a boss 23 or enga ement with oneside of the drawing pot as will be hereinafter described.

Resting on supporting blocks 24 in the container 19 is the drawing pot designated generally 25 which in its resent form comprises a substantially cylin rical body 26 which is closed at its lower end by a bottom wall 27. in the cylindrical body 26 is a port 28 which communicates with the interior of the receptacle 19 and formed on the exterior of the body 26 diametrically op osite the port 28 is a boss 29 which is provi ed with a passage 30. 4 Projecting upwardly within the drawing ot in spaced relation to the side walls thereo is a nipple 32 having formed therein an upwardly extending passage 31 which communicates with the passai 30 as clearly illustrated in the drawing. shown in Fig. 1, the drawing pot 25 is of circular cross-sectlon and the ni ple 32 is substantially crescent'sha .ed an this construction will producetubing having a circular cross-section with a crescent shaped stri of contrasting glass embedded therein. t is to be understood however that the drawing pot may be varied in sha so as to produce tubing havinglthe desire lkew1se the s ape of the nipple 32 ma Abe cross-sectlon and ing the desired cross-section. .As shown 1n Fig. 2,-the bottom 27 of the drawing pot 25 is provided with Van opening 33 for the reception of a pipe 34 by means of which air may be introduced into the interior of the glass drawn so as to form a bore therein, it being obvious that the ipe is admitted through suitable openings ormed in the bottom of the container .19 and the' bottom 11 of the furnace. 1 p l In operation, clear glassv 35 fis ladled throu h the opening 15 into the container 19 and t e desired contrasting glass 36 is ladled into the receptacle 22, it being understood that the temperature of the furnace' is maintained to a ldegree where the glass will remain fluid. A bait isthen let down throu h the drawing opening 17 into contact with t e-surface of the glass in the drawing pot 25 and upon being drawn upwardly it will be seen that the glass contained in the drawing pot 25 will follow the bait and assume the shape given to it by the drawing pot. Obviously as the clear glass is drawn upwardly, the contrasting glass flowing through the openings 21, 30 and 31 will follow and by reason of the initial shape given to it by the nipple 32, its contour will remain substantially the same throughout the entire length of the draw. Upon admitting air through the pipe 34 it will be obvious that a bore will be formed within the glass which is being drawn thus forming a tube having embedded beneath its surface a stripe of contrasting glass. It is obvious that by altering the shape of the drawing pot 25 lens front tubing ma be produced and also that by changing the shape of the nipple 32 the shape of the stripe of contrasting glass will be altered.

The device as above described lends itself readily to the rapid and accurate drawing of glass and, moreover, the drawing pot may be readily removed and a pot of the desired shape inserted where it is desired to change the style of tubing being made.

While in the foregoing there has been shown and described the preferred embodiment of my invention it is to be understood that minor changes in the details of construction, combination, and arrangement of parts may be resorted to without departing from the spirit and scope of the invention as claimed.

I claim:

1. In an apparatus for drawing glass, a container for molten glass, a receptacle for contrasting glass adjacent said container, a drawing pot within the container, said drawing pot coinmunicatin with the container and a hollow nipple within the drawing pot communicating with the receptacle for contrasting glass.

2. In an apparatus for drawing tubing, a container for molten glass, a drawing pot within said container communicating therewith, a receptacle for contrasting glass a'djacent said container, a hollow glass shaping nipple within the drawing pot, said nipple communicating with the interior of the receptacle for contrasting glass and means for introducing air into the' drawing pot near the nipple.

3. In a tube drawing apparatus, a drawing pot having an air admitting opening in its iottom and an upwardly extending shaping nipple within the drawing pot near the air admitting opening.

4. In a tube drawing apparatus, a drawing pot, means for admitting glass to the drawling pot, said drawing pot having an air admittlng opening in its bottom, a glass shaping nipple extending upwardly from the bottom ofthe drawing pot near the air admitting opening and means for admitting contrasting glass to the shaping nipple.

5. Glass drawing apparatus including a container for molten glass, a receptacle for contrasting glass adjacent said container, said container having an opening communieating with the receptacle, a boss surrounding the opening and projecting into the container, a drawing pot in the container, a boss on said drawing pot, said boss abutting the afore-mentioned boss and having a passage therein which communicates with the opening in the container, a hollow nipple extending upwardly within the drawing pot, the hole in the nipple communicating with the passage in the boss, and a port in said pot for admitting glass from the container into the pot.

6. Glass drawing apparatus including a container for molten glass, a receptacle for contrasting glass adjacent said container, said receptacle having a passageway in one wall, a drawing pot in the container, the walls of said drawing pot being in spaced relation to the walls of the container and a hollow nipple extending upwardly within the drawing pot and spaced away from the walls thereof, said drawing pot having a passageway connecting the opening in the nipple with the passa eway of the receptacle and having a port or admitting glass from the container into the interior thereof.

WILLIAM HOWARD SAID.l

y no 

